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Risk Management Activities - Commodity derivative instruments not designated as hedging instruments (Details) - Non-Hedges - Commodity risk management | Dec. 31, 2020 MWh J t | Dec. 31, 2019 MWh J t
--- | --- | ---
Electricity |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount sold | 12,944,000 | 16,097,000
Notional amount purchased | 8,258,000 | 7,204,000
Natural gas |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount sold | J | 23,035,000 | 38,062,000
Notional amount purchased | J | 177,448,000 | 55,023,000
Transmission |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount sold | 0 | 0
Notional amount purchased | 1,578,000 | 1,818,000
Emissions |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount sold | 1,831,000 | 184,000
Notional amount purchased | 2,112,000 | 138,000
Notional amount sold | t | 2,160,000 | 2,436,000
Notional amount purchased | t | 2,365,000 | 2,446,000

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